building method and buildings

ABSTRACT

A method and designs of underground buildings for any purpose that do not introduce any element above ground level, thus allow agricultural use of the land by any agricultural machine or technology or using the land for recreational park.

FIELD OF THE INVENTION

The present invention relates to better use of land and specifically tounderground building occupied by humans where the top ground serve foragricultural purposes or recreational parks.

BACKGROUND OF THE INVENTION

As world population continues to grow there is a continuous demand forland for housing, offices, industry, agriculture, amuse park andrecreational green parks. When human civilization invented agriculture,permanent location inhabitation started where there were lands suitablefor agricultural crops. As villages developed into cities, thisdevelopment came on the expense of fine land highly suitable foragriculture. Today, there are many cities, which are congested withconcrete building and far less than desired green areas within the city.Further, continuous demand for new offices building and malls near thecities threaten to diminish the reserves of good land for agriculturaluse. This causes the authorities to become reluctant to approve newbuilding projects on agricultural land. However, there are positiveaspects to build new office buildings, shopping centers, apartmentbuildings and light industry near existing cities as this can savetravel time, air pollution and money to commuters from city to neardestinations rather than far destinations.

Therefore there is a need for innovative technology that will enabledual use of agricultural land so new building can be built withoutlosing agricultural land.

SUMMARY OF THE INVENTION

According to the present invention, there is provided a method anddesigns of underground buildings for any purpose that do not introduceany element above ground level, thus allow agricultural use of the landby any agricultural machine or technology or using the land forrecreational park.

One aspect of the invention is an underground building covered bytopsoil free for any agricultural activity by any agriculturaltechnology or machinery.

Another aspect of the invention is that agricultural equipment can beused on this land without interruption.

Yet another aspect of the invention is that underground building haveconvex top structure that carries the topsoil load and plants weight.

Another aspect of the invention is underground building having aventilation system which intake fresh air from a location far from thearea on top of that underground building.

Yet another aspect of the invention is underground building having aventilation system, which intakes and exhausts air through retractablepipes.

Still another aspect of the invention is that the ventilation system airintake pipes are equipped with closing devices.

Still another aspect of the invention is that the ventilation system airintake pipes closing devices are remotely opened and closed.

Still another aspect of the invention is that the ventilation system isequipped with air moving devices such as electrically driven axial fans.

Still another aspect of the invention is that the ventilation systemmonitors air quality in the building and increase or decrease airflowvolumes by changing amount of electrical current or frequency suppliedto the electrical motor fans.

Still another aspect of the invention is that the ventilation systemcomprises devices that monitor the level of oxygen and carbon dioxide inthe building and increase or decrease the amount of fresh air suckedinto the building by controlling the electrical fan and shutters in theair pipes.

Still another aspect of the invention is that the ventilation systemcomprises devices that monitor the air pressure in the building, andmaintain it slightly higher than air in the surrounding so that gasesfrom the soil and concrete will not dissipate into the building.

Still another aspect of the invention is underground building havingventilation pipe that may change its height according to needs, frombelow ground level to few meters above ground level.

Still another aspect of the invention is that the underground buildingventilation pipe that is equipped with remotely operated closingdevices.

Still another aspect of the invention is that the underground buildingventilation pipe that is equipped with remotely operated warning light.

Still another aspect of the invention is that underground buildingventilation pipes position height and state is controlled by remotelyoperated control system.

Still another aspect of the invention is that underground buildingventilation system comprises high-pressure air tank to supply air tounderground building.

Still another aspect of the invention is that underground buildingventilation system exhaust air is flowing outward through access tunnelconnecting the underground building to ground level.

Still another aspect of the invention is that underground buildingventilation system comprises a shutter to block main fresh entrance inemergency.

Still another aspect of the invention is that the underground buildinghas underground road which its opening to ground level is far from theunderground building.

Still another aspect of the invention is that the underground buildinghas water basin under the building.

Still another aspect of the invention is that the building is equippedwith electrical water pump and pipes that sucks water from the buildingfloor and flow that water away.

Still another aspect of the invention is that underground building hasat least one underground car parking floors.

Still another aspect of the invention is that underground building hasparking places for electric powered vehicles.

Still another aspect of the invention is that underground buildings haveat least one corridor that connects them and allows human walking andelectrical vehicles travel between buildings.

Still another aspect of the invention is that underground building hasemergency evacuation lift shaft that do not protrude ground level.

Still another aspect of the invention is that underground building hasemergency evacuation shaft equipped with stairs and ladders, said shafttop preferably ends at ground level or slightly below.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further understood and appreciated fromthe following detailed description taken in conjunction with thedrawings in which:

FIG. 1 is a vertical cross section through underground buildingaccording to one embodiment of the invention.

FIG. 2 is a vertical cross section through underground building showingdetails of the ventilation system according to one embodiment of theinvention.

FIG. 3 is a top view of underground buildings with undergroundventilation system and underground roads, according to one embodiment ofthe invention.

FIG. 4 is a section view of underground building retractable-variableheight ventilation pipe according to one embodiment of the invention.

FIG. 5 is a section view of underground building retractable-variableheight ventilation pipe according to another embodiment of theinvention.

FIG. 6 is a horizontal section view of underground building sectionventilation pipes.

DETAILED DESCRIPTION OF THE INVENTION

This invention discloses a method and designs for underground buildingsthat may support prolonged human activity inside such building thusleaving the top surface of the land to be used for agricultural orgreen-park for recreational purposes.

As world population increases, demand for agricultural productsincreases, which increases the importance of agricultural lands.However, agricultural lands founds around ever growing cities, which putpressure to build new building on these lands. The location of theselands is an advantage to city residents, which prefer to travel lessfrom home to work and back. Thus, while agricultural lands are importantfor agricultural crops, high demand for lands near cities for newbuilding projects prevent this use. This justified need to preserveagricultural land, forces entrepreneurs to build new projects far fromthe city. This causes lengthier travel time from city to newindustrial/office parks, increases transportation cost and airpollution. Further, when building new cities, this invention could helpin design compact city which make use of underground area for officebuilding while the upper land surface serve for green parks, thusimproving the life quality in the city.

Underground cellars are common knowledge and usually found underexisting buildings, however, current underground structures preventsintensive agricultural activity by tractors, combines trucks and airspraying.

Further, underground building serving as office building while the landabove is a green park would create a highly pleasant working area sinceworkers of these building could spent launch breaks in such park.

It is the aim of this invention to disclose a method and designs, whichenable dual use of agricultural land, i.e., intensive agricultural useof the land and high quality human environment for any human activity inunderground buildings.

FIG. 1 is a vertical cross section through two adjacent undergroundbuildings 10 and 40, according to one embodiment of the invention. Anunder ground road (tunnel) 14 allows humans and automobiles to enterunderground building 10 from entrance 17, which is beyond from theboundaries of the agricultural land. The distance from entrance 17 andnearest building should be long enough to assure that polluted air dueto agricultural activity such air spray of harmful chemicals will notpenetrate the underground building. Such distance could start at tenmeters and preferably more than hundred meters. If the entrance 17 isnear the agricultural land, the ceiling 16 is preferably under theground level. In case the entrance 17 is not in the agricultural land,the ceiling 16 is preferably above ground level as shown in FIG. 1, thuscreating a shelter for security personnel checking the coming vehicle.This small building is preferably located at the edge of theagricultural land. However, since chemical spraying required foragricultural need is not daily routine for the same land, such entranceis preferably equipped with doors than can seal the tunnel 14 frompolluted air while the air is polluted. Thus the underground buildingleaves the ground top surface 20 uninterrupted for any agricultural useor green-park, or any other use. This tunnel 14 and its characteristicsare one aspect of the invention.

The underground building is equipped with sophisticated ventilationsystem—shown in FIG. 2—that provides continuous flow of fresh air intothe building and continuously removes used air from the inside of thebuilding to the atmosphere. In case of emergency, when main fresh airintake channel, 54, 59, 69 in FIG. 1, cease to operate because ofmalfunction of electric fans or blockage, pipes 24 and 25 are activatedand erected from under ground level position to the shown position.Routinely, these retractable pipes top ends are well below ground level,preferably 50 centimeters, to allow heavy agricultural machines such astractor 22 travels on their tops. These retractable air intake and airexhaust pipes are another aspect of the invention.

Building 10 has multi floors 12 and part or all serve as parking lot forcar and trucks. Optionally there is also a parking place for electricalvehicles that may be used to travel between underground buildingsthrough under ground corridors 44, which are another aspect of theinvention. Preferably, the underground building is equipped with convexdome 24 that efficiently carry the soil 21 load and plants (not shown)weight. This convex dome is preferably made of reinforced concrete. Theunderground building optionally has bottom basin 9 where undergroundwater may be accumulated and removed by a drainage system 90-95 shown inFIG. 2. Each underground building is optionally equipped with emergencyevacuation lift 26 traveling in shaft 28. The lift 26 top surface atmaximum lift top position do not protrude ground level. Thus, human needto leave the building using this lift, in emergency case, walks out thelift through lift door 27, stands on vertically moveable box 31 andactivates it travel upward. Box 31, equipped with electrical motor 32that is part of moving mechanism similar to system 200-207 described inFIG. 5. This moving system lift the box 31 to about ground level, whilethe horizontal cover 34 is raised, by an electric or manual actuator 36,thus, when the box 31 top level reaches about ground level 20, peoplecan leave the box and walk away. Then, the box 31 returns to bottomposition to take additional passengers exiting the lift 26.

This can be done automatically after predetermined time of being inupright position or reacting to direct activation of people in the lift26. Routinely, the cover 34, preferable made of steal, is at horizontalposition, covering the space 30. The cover 34 is installed on verticalconcrete walls 35, which their top surfaces are below ground level 20,about 30 to 50 centimeters. This is a strong structured plate thatallows heavy loads such as tractor wheel driving on it without damage tothe cover. Thus when cover 34 is in its non-emergency state, i.e., lyinghorizontally, any agricultural activity in the field 20 can take place.

In addition emergency stairs shaft are optionally built to allowemergency exit from underground building. Such stair shafts could endbelow ground level, similar to shaft 40, so that humans can exit usingstairs or ladders. Such stairs shaft, accessed from any floor, isequipped with cover 34 as explained before. Further, emergencyevacuation shafts for lift and stairs could end above ground level sothat people can reach ground level into a small building having a doorthat can be opened from inside this small building, thus the evacueesmay leave these shafts and go away by foot on the field or park.

Another option to leave such underground building is by using lift orstairs up to the level where tunnel 14 entered the underground buildingand leave the building through tunnel 14 by walking or driving cars.

The ventilation pipes shown in emergency state has remote controlledshutters (128 in FIG. 2) on their openings. Thus, when the pipes areerected, the shutters are open to allow fresh airflow into pipe 25 tothe building and used air to flow out through pipe 24. These two pipescan be installed into one big pipe where their opening face differentdirections. This ventilation system is another aspect of the invention.

Usually, when not at emergency state, humans enter and leave thebuildings through tunnel 14. Each underground building is preferablyequipped with underground access tunnel 14 or a tunnel connecting abuilding to the underground access tunnel 14. Thus, any agriculturalactivity on field 20 can take place without interrupting or endangeredhuman activities in the underground building.

Properly designed and built underground building according to thepresent invention have many advantages over usually above groundbuildings:

Firstly, such buildings are highly earthquake resisting since earthquakehorizontal loads are opposed by the soils 21 that supports the entirevertical walls. This is a very important factor that reduces theunderground building structure required strength and cost.Secondly, underground buildings are not influenced from extreme weatherchanges thus air-conditioning costs are reduced.Thirdly, underground building can be built under agricultural landsaround the city thus shortening the distance and time to travel from thecity, thus saving time, fuel cost and pollution.Fourthly, since agricultural land is much cheaper than land for officebuilding, the over cost of building and land is low.Fifthly, since air entering and exiting the building floors arecontrolled, fire suppression is easier by shutting the fresh air supplyto a fire. This issue will become clear after reading, the ventilationsystem description for FIGS. 2 and 6.

To increase human ease of prolog stay in under ground building, innerunderground building walls may be equipped with natural landscapepictures or Plasma or LCD screens showing natural landscapes or even thelandscape of the land on top of the underground building. Further,natural voices of birds and wind and trees noises may be played at lowvolume to give feeling of nature atmosphere. Also natural scents may besprayed to give the air nature “touch”. All these features may beactivated manually or by a computerized ventilation system.

Thus, underground building, according to this invention enable prolongedhuman activity including living, office work, commercial activity andlight industry such printing, etc. This is possible since each sectionof the underground building preferably has its own ventilation system sothat fumes are removed without polluting any other sections in thebuildings. Any section of the underground building is preferablyaccessed by underground road and there is preferably, parking places forelectrical vehicles near each section so that people can travel milesbetween many underground buildings.

The emergency ventilation pipes 24, 25 diameters are at least 10centimeters and preferably about 50 centimeters but larger diameterscould be used. These pipes equipped with electrical fans. An undergroundbuilding could be equipped by any number of such pipes. The electricgrid pole 18 provides electricity to the underground building.

FIG. 2 shows a vertical cross section through underground building. Theair ventilation system main components are schematically depicted sothat people skilled in the art of ventilation design system can preparedetailed design plan. Fresh air 55 is sucked into pipe 54 equipped withelectrical driven, preferably, axial fan 58. Fresh air is flown throughunderground about horizontal pipe 59, toward vertical pipe 60 that runsparallel to the underground building wall 10 (FIG. 1). At each floor 62,a short horizontal pipe 67 a, flows fresh air into the floor. At eachfloor 62 other side, there is air exhaust pipe 67 b, that intakes usedair and flows it into exhaust pipe 69. The used air 68 is now flowing upin vertical pipe 69 toward about horizontal exhaust pipe 70 and towardthe vertical exhaust pipe 72, which is optionally equipped withelectrical driven axial fan that pushes the used air upward to the exit74. Air exits 67 b preferable equipped with remotely operated shuttersthat have variable opening thus, a remote control ventilation system canchange this shutters opening in order to increase or decrease the airpressure inside the building to prevent radon dissipation from the soiland concrete walls into the building.

The ventilation system optionally equipped with high-pressure air tanks66. The compressor 64 is connected to the fresh air pipe 60 andcompresses the air into tanks 66. These tanks could hold air at 200 barsor more. In emergency, when fans 58, 71 cease operating and carbondioxide level exceeds maximum allowed level for humans or any otherpreferred level, the ventilation control system, shuts the shutter 80 toclosing position 82 and opens the high-pressure tanks 66 that supplyfresh air to the ventilation system. The high-pressure tanks 66 areconnected to the ventilation system through a pipe (not shown), whichbypass the compressor. Thus, in emergency, fresh air from the highpressure tanks flow into main feeding pipe 60 and to each level pipe 67a. The shutter 82 prevents fresh air to leave the system through pipe59. The shutter 80 has a rotating mechanism 81 that is controlled by theventilation control system. This mechanism can be build by differentdesigns. One simple mechanism is the one found commercial buildingelectrical shutters. A dc electrical motor that change rotationdirection according to electrical current direction. The electricalmotor shaft drives a planetary gearbox which decrease the electricalmotor number of revolutions by a factor of about 30 thus increasing theout torque that moves the shutter 80 into position 82 and vice versa.Stopper 83 blocks the shutter and the electrical current to the motor isstopped. When the emergency situation do not exist the ventilationsystem return to normal procedure: the shutter 82 is opened to position80, the electrical fan 58 pushes fresh air into pipe 59, and compressor64 pumps air into high pressure tanks 66.

The intake pipes 54, 126 are variable height pipes equipped with a topclosing devices 50 and 128, so when there is a need to spray antipesticide for agricultural purposes, the pipe closing, device closes thepipe and prevent harmful gases entering the ventilation system. Thisclosing device is electrically operated by the ventilation controlsystem. The activation of this closing and height changing can be donemanually or preferably automatically by lifting-lowering electricalmechanism shown if FIG. 4. The ventilation control system, which ispreferably equipped with sniffing sensors that continuously monitors thequality of air entering pipes 126 and 54. Each of ventilation pipes ispreferably equipped with powered fan that forces air into the buildingor outside the building.

The emergency pipe 126 is preferably equipped with closing device128—various shapes 128 b and 128 c shown in FIG. 4—so that when the pipe126 is retracted, the closing device 128 lies under ground level and itis strong enough to support tractor wheel. Fresh air intake pipe 126 isequipped with preferably, electrical axial fan, which is remotelyoperated by the ventilation control system. In case of electricitysupply breakdown, the underground building is equipped with electricalgenerator 140 in FIG. 2, installed in a independent section and poweredby fuel or pressurized air pressure engine. This electrical generator140 receives its air through the ventilation system—pipe 67 a and itsexhaust fumes are removed by a pipe 67 b to pipe 69.

The access tunnel 14 is preferably serves as used air exhaust channelthat receives airflow from pipe 69. This helps remove cars exhaust gasesfrom entering the building through tunnel 14. In such case, optionalaxial fans could be installed on tunnel 14 ceiling directing airflowtoward the entrance 17. This is another aspect of the invention. FIG. 6is a horizontal cross section of the ventilation system in each floor.The fresh air supply pipe 60 provides air to pipe 67 a, which ispreferably equipped with electrical axial fan 67 d. An emergency freshair supply pipe 126, also shown in FIG. 2, is also connected tohorizontal pipe 67 a that flows fresh air into the building section.Thus, in case airflow in pipe 60 is blocked, the ventilation controlsystem erects pipe 126 n to above ground level, opens its, closingdevice 128 and turns on its electrical fans. At the same time theventilation control system shuts pipe 59 using mechanism 80-83 toprevent fresh air exiting the system. Used air in floor 62 flows intopipe 67 b and into vertical pipe 69 also shown in FIG. 2. In case ofblockage in pipe 69, the ventilation control system erects emergencypipe 122, opens its closing device 128 to let used air leave theventilation system. The ventilation floor system preferably equippedwith axial fan 67 d and variable position shutter 67 c thus air pressurein floor 62 can be increased either by increasing the electrical powerprovided to axial fan 67 d or by narrowing the exhaust are by shutter 67b, and vice versa. The outer wall 10 is shown.

Air condition system, is optionally installed in each floor to warm orcool the air. The air condition system is optionally controlled by theventilation control system and having manual override.

The underground building is optionally equipped with water drainagesystem 90-95. There are locations where underwater are found near groundlevel surface thus an underground building could be surrounded by water,which could penetrate into the underground building and flow down to thebuilding bottom 12. To remove this water, a pipe 90 which its opening isclose to the space 112 floor, sucks this water by the power of electricpump 92 which further pushes the water upward into pipe 92 toward a pipe94 which may flow the water toward sewerage system or water reservoir.

FIG. 3 is a top view of underground buildings arrangement according toone embodiment of the invention. Vehicles use public ground level road100 to arrive these underground buildings 200, 300. Access road 102 isan exit from road 100 toward the underground parking lot floors 108. Thecircle road 106 may go down to bottom-floor of the building. The exitroad 104 serves cars leaving the under ground parking lot 108 to traveltoward road 100.

The underground building 200 is preferably divided into sections 112where each section receives its own fresh air through main fresh airsupply pipe 122 (only half is show for purpose of clarity) and sectionfresh inward pipe 126 and used air outward pipe 129. Thus, each sectionreceives air independently from other sections. Optional electricalaxial fans could be installed in each pipe of the ventilation system toincrease airflow as shown in FIG. 6. The used air, flows through pipe130 into pipe 136 and into a vertical exhaust pipe 138 (equivalent topipe 73 in FIG. 1), which is far from the area that covers theunderground building, thus allow intensive agricultural use of the landover this building. The fresh air is entered the ventilation systemthrough vertical pipe 120, which like pipe 138 is located far from theare above the underground building. From the intake pipe 120, fresh airflows (driven by electrical powered axial fans) toward pipes 122, 126and to the different underground building's sections 112. Both buildings200 and 300 are preferably equipped with all the emergency equipmentdepicted in FIG. 1, such as retractable-variable height pipes 24, 25 andemergency exit lifts 26, 31. Corridors 150 serve people going fromsection to section and allow electric vehicles travel between sections.Each building is equipped with lifts that travel between the buildingfloors. Section 110 is optionally parking lot, preferably at each floor,so that people parking their cars in parking lot 108, could useelectrical vehicle parking in section 110 and travel to remote sectionsthrough corridors 115. These electrical vehicles could belong to acarsharing fleet operated by smart cards. Each section preferablyequipped with local cellular network antenna or a cell of cellularsystem thus enabling occupants in these building to use their cellphones.

The ventilation system is preferably comprises sensors that monitors airquality entered the ventilation system to prevent intake of chemicals,carbon dioxide level and radon level. When chemicals above permittedlevel are found in the intake pipe 59 or inside the building, thecontrol system shuts shutter 80 and activates the high pressure backupsystem to provide fresh air to the under building occupants. Anotheremergency case is when the electrical fans 58 and 71 stop functioning.Then the same emergency procedure repeats itself however, pipes 24, 25are erected to allow fresh air intake and use air exhaust through thesepipes. If the air coming from pipe 25 is good for breathing, thehigh-pressure tanks may stop providing their stored air. If however, theoutside air contains chemicals, the pipes 24, 25 are retracted andsealed and emergency alarm is sound and emergency signs are lightened toinform people to leave the building through access road 14. Theventilation control system preferably incorporates smoke and firesensors. In case of fire, emergency control system identifies thesection where fire broke, activates the emergency signs to order peopleto immediately evacuate the fire zone and close the shutters installedin fresh inlet pipes 67 a, that provides fresh air to the fire zone,thus preventing oxygen supply to the fire in the fire zone. Theseshutters have similar mechanism 80-83 described for FIG. 2. Similarshutters are preferably installed in exit pipes 67 b thus the controlsystem may closed them partially to regulate the air pressure in eachsection in order to prevent Radon dissipating into the undergroundbuilding.

FIG. 4 is a cross section through retracting variable ventilation pipe126 and 122 in FIG. 2. The top blocking “hat” 128 comprises a flat,preferably, circular plate shown in its upright position where the holes129 allows fresh atmospheric air 130 to flow into the pipe 127. Whenblocking element is in its lowest position its top surface blocks thepipe 126 top entrance and holes 129 are blocked by the cylindrical wallsof pipe 126. In routine state of the underground building, pipe 126 isnot in use and it is retracted to the position 122 in FIG. 2 and the hatis in lowest position below ground level thus it do not interfere withagricultural activity. The raising/lowering mechanism comprises anelectric motor, which rotates clockwise and anti-clockwise at willcombined with planetary gearbox in the same package 200. The shaft 202rotates clockwise or anticlockwise according to desired function ofraising or lowering the hat 128. The shaft 202 has a driving threadalong it length and nut 204 having the same thread as the shaft 202,travels up or down along shaft 202. Nut 204 is firmly connected tocylinder 206. The top edge of cylinder 206 is connected through pin 210to the bottom of pipe 127. Thus, when motor 200 rotate in one directionit pushes the hat 128 upward and when the motor 200 rotates the oppositedirection, it pulls the hat 128 downward. Thus the ventilation controlsystem can open or close the entrance of pipe 126. A similar mechanism220-229 connected to pipe 125 pushes pipe 126 upward or pull itdownward. It should be noted that the length of movement corresponds tothe length of the shafts 226, 206, the longer the shaft, the lengthierthe movement and the length of the moving pipe. This mechanism is verywell known but other mechanisms can be used. One example is shown inFIG. 5.

FIG. 5 shows the ventilation-retracted pipe 126 equipped with differentlifting—retracting mechanism 200-207. Electrical motor 200 is the sameas described in FIG. 4. The t rotating shaft has no threads but a conic45 degrees gear 202 is installed on its top edge and rotates whit theshaft 201. The gear 202 is engaged with correspondent gear 203 which isalso a conic gear which installed on rotatable shaft 206 which ismounted into a bearing house 207 which is firmly attached to pipe 126.On the shaft 206 a straight gear 205 is installed and rotate with conicgear 206, a rectangular gear rack 204, which is firmly attached to thepipe 127 is engaged with gear 205. Thus, when electrical motor 200rotates in one direction it lifts the hat 128 a, and when it lift in theopposite direction, it lowers the hat 128.

The advantages of the mechanisms shown here is that they installedwithin the pipes thus protected from dirt. The ventilation controlsystem preferably, lifts the bottom pipes first and the topper later sothe hat 128 is lifted when it is well above ground level so that dirtwill not enter the pipe as it sucks fresh air into the undergroundbuilding.

The horizontal cross section of the underground building is optionallymade of circular shape to increase the stiffness of the undergroundbuilding to underground hydrostatic pressure and earthquake resistance.The underground building domes 24 in FIG. 1 or 110 in FIG. 2 have betterstrength than flat ceiling because the heavy weight of soil 21, cropsand trees and heavy vehicles such trucks, combines and tractors.

The underground building could be accessed by underground train (metro)so that a underground train station could be located near such buildingand underground tunnel connect this station to the underground building.

It will be appreciated that the invention is not limited to what hasbeen described hereinabove merely by way of example. Rather, theinvention is limited solely by the claims, which follow.

1. A method that allows using land for agricultural or recreationalpurposes and build building underground this land for human usecomprises of: a. an underground building which is completely underground level; b. a layer of soil on top of said building, having topsurface in about similar level of nearby soil so that the soil enablesagricultural purposes or green park for recreational activities.
 2. Amethod according to claim 1 where underground building has access tunnelwhich its exit is far from the underground building perimeter.
 3. Amethod according to claim 1 where underground building has ventilationsystem that intake fresh air through pipe which its intake fresh airopening is not interfering with potential agricultural activity.
 4. Amethod according to claim 1 where underground building has ventilationsystem that intake fresh air through pipe which its intake fresh airopening is far from the underground building perimeter.
 5. A methodaccording to claim 1 where underground building has ventilation systemthat comprises retractable intake air pipe.
 6. A method according toclaim 1 where underground building has ventilation system that comprisespowered fan that cause fresh air entering and leaving the ventilationsystem.
 7. A method according to claim 1 where underground building hasventilation system that comprises devices to increase or decrease theairflow within the ventilation system.
 8. A method according to claim 1where underground building has ventilation system that comprises devicesthat control the air-pressure within the underground building.
 9. Amethod according to claim 1 where underground building has ventilationsystem that comprises high-pressure air tanks to provide fresh air tounderground building occupants.
 10. A method according to claim 1 whereunderground building has ventilation system that exhaust air through caraccess tunnel thus removing cars exhaust gases entering the undergroundbuilding.
 11. A method according to claim 1 where underground buildinghas electric generator that provides electricity in case of publicelectricity failure.
 12. A method according to claim 1 where undergroundbuilding has emergency lift car and shaft that while not in use, do notinterfere with potential agricultural activity of the land above theunderground building.
 13. An underground building according to claim 1having a convex structure dome to carry soil load.
 14. An undergroundbuilding according to claim 1 having a basin that collects water seepinginto the building.
 15. An underground building according to claim 1having a drainage system that removes water from water basin.
 16. Anunderground building according to claim 1 having corridors connecting itto another underground building.
 17. An underground building accordingto claim 1 having parking places for cars.
 18. An underground buildingaccording to claim 1 having electric vehicles for transportation withinthe building.